Prometheus middleware for chi.
This is a port of negroni-prometheus middleware (written by Rene Zbinden).
ported for chi v5
Instead of logging request times, it is considered best practice to provide an endpoint for instrumentation tools (like prometheus).
go get github.com/766b/chi-prometheus
Take a look at the example.
An endpoint with the following information (stripped output):
# HELP chi_request_duration_milliseconds How long it took to process the request, partitioned by status code, method and HTTP path.
# TYPE chi_request_duration_milliseconds histogram
chi_request_duration_milliseconds_bucke{code="OK",method="GET",path="/metrics",service="serviceName",le="300"} 1
chi_request_duration_milliseconds_bucke{code="OK",method="GET",path="/metrics",service="serviceName",le="1200"} 1
chi_request_duration_milliseconds_bucke{code="OK",method="GET",path="/metrics",service="serviceName",le="5000"} 1
chi_request_duration_milliseconds_bucke{code="OK",method="GET",path="/metrics",service="serviceName",le="+Inf"} 1
chi_request_duration_milliseconds_sum{code="OK",method="GET",path="/metrics",service="serviceName"} 2.003123
chi_request_duration_milliseconds_count{code="OK",method="GET",path="/metrics",service="serviceName"} 1
chi_request_duration_milliseconds_bucke{code="OK",method="GET",path="/ok",service="serviceName",le="300"} 0
chi_request_duration_milliseconds_bucke{code="OK",method="GET",path="/ok",service="serviceName",le="1200"} 0
chi_request_duration_milliseconds_bucke{code="OK",method="GET",path="/ok",service="serviceName",le="5000"} 2
chi_request_duration_milliseconds_bucke{code="OK",method="GET",path="/ok",service="serviceName",le="+Inf"} 2
chi_request_duration_milliseconds_sum{code="OK",method="GET",path="/ok",service="serviceName"} 4747.529026
chi_request_duration_milliseconds_count{code="OK",method="GET",path="/ok",service="serviceName"} 2
# HELP chi_requests_total How many HTTP requests processed, partitioned by status code, method and HTTP path.
# TYPE chi_requests_total counter
chi_requests_total{code="OK",method="GET",path="/metrics",service="serviceName"} 1
chi_requests_total{code="OK",method="GET",path="/ok",service="serviceName"} 2